A) Platy helminthes - Trematoda - Planaria
B) Echinodermata - Asteroidea - Star fish
C) Arthropoda - Insecta - Spider
D) Mollusca - Cephalopoda - Unio
Correct Answer: B
Solution :
Star fish (Astenia)-belongs to class - Asteroidea, sub phylum-Eleutherozoa, phylum-Echinodermata.
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